Release 0.4.0: add Leaf Fall and Z-Zoom logo intro animations

Two new framework-agnostic logo intro animations in the same family as
MakeabilityLabLogoGridFade:

- MakeabilityLabLogoLeafFall: a full-canvas triangle grid flutters down
  from the top like falling leaves (horizontal sway + tumble that settle to
  exact rest), then the logo's pieces fall in to complete it. Outlines fall
  as their individual M/L line segments, randomly sequenced.
- MakeabilityLabLogoZoomFade: pieces fly in toward the viewer from a shared
  perspective origin, sweeping inward and shrinking to land on the screen
  plane, with per-piece depth variation for a true 3D feel.

The colored logo emerges from the backing grid (its 12 colored cells are
pinned to the logo colors) rather than dropping redundant copies; only the
black M-shadow, translucent L overlay, and outline segments fall/zoom in on
top. Shared grid-alignment, piece-building, and transform helpers are
factored into makelab-logo-intro-utils.js, and GridFade is refactored to
reuse them (no behavior change).

Includes demo apps for both animations and rebuilt dist/ bundles.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: jonfroehlich